(19)
(11) EP 2 474 840 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.01.2013 Bulletin 2013/01

(43) Date of publication A2:
11.07.2012 Bulletin 2012/28

(21) Application number: 12162412.6

(22) Date of filing: 28.09.1999
(51) International Patent Classification (IPC): 
G01V 1/38(2006.01)
 B63B 21/66(2006.01)
(84) Designated Contracting States:
FR IT NL

(30) Priority: 01.10.1998 GB 9821277

(62) Application number of the earlier application in accordance with Art. 76 EPC:
07113028.0 / 1847851
99943180.2 / 1119780

(71) Applicants:
  • WesternGeco Seismic Holdings Limited
    Road Town, Tortola (VG)

    IT NL 
  • Services Pétroliers Schlumberger
    75007 Paris (FR)

    FR 

(72) Inventors:
  • Hillesund, Oyvind
    N-1312 Slependen (NO)
  • Bittleston, Simon
    Bury St Edmunds, Suffolk IP29 5GR (GB)

(74) Representative: Suckling, Andrew Michael 
Marks & Clerk LLP Fletcher House Heatley Road The Oxford Science Park
Oxford OX4 4GE
Oxford OX4 4GE (GB)

   


(54) Control system for positioning of marine seismic streamers


(57) A method of controlling position of a seismic streamer (12) comprises: calculating magnitude and direction of a desired total force or displacement to apply to the seismic streamer; adjusting, based on forces exerted on the streamer by hydrodynamic deflecting surfaces (28) in a force axis, the calculated magnitude of total force or displacement to form an intermediate desired total force; adjusting a common angle between hydrodynamic deflecting surfaces (28) to produce the intermediate desired total force along the force axis; comparing the calculated desired common wing angle to the current common wing angle to calculate a change in the wing angle; and introducing a splay angle in to the hydrodynamic deflecting surfaces to produce a rotational movement to align the force axis with the direction of the desired total force.







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